Made some progress today. Finally managed to get a dry day when I wasn't utterly spammed with work to get ol' Safka up in the air and have a go with some rust protectant. There's obviously some rust, but not too bad (yet) and I wanted to get some protective stuff on before the salt starts being laid on the roads. Hopefully if I can get through winter without too much harm being done, I can then take him off the road to give the underside the proper POR15 treatment come the better weather. That's the plan.
To this end I've been using ACT 50 which is a magic jizooom that rust converts and forms a film that stop water/grime penetration as well. I swear by this stuff, used it on bikes for years and it's just magic. The best thing is, it's washable-offable with some degreaser come summer so I'll be able to paint POR on without a lifetime's prep work like if I used waxoyl or something more "durable". Besides, waxoyling is the single shittiest, most horrible job ever by all accounts. Anyway...
This is the O/S rear arch before
This is it after brushing, cleaning, then wiping everything over with ACT 50. You can see on like the shocker and exhaust shield how it's already started to convert the surface rust. In a couple of weeks' time I'll get in and do another application (weather permitting) and catch anything I missed
Front arch after cleaning/treating
All this is pretty sound though the nadgery corners by the brake cooling ducts, the edges of the wings meeting the arch, etc are all pretty cheesy to be fair. Hopefully there'll still be enough metal there to paint come spring
Also got the essential stickerage sorted out lol
And managed to get what pics I could of the exhaust that's alleged to have been made up by a Rolls-Royce engineer. That much is true, evidently the guy was a family friend who serviced the car for the previous owner, but whether he "made" this exhaust or knocked it together from off the shelf bits I have no real clue. It certainly seems to be all-stainless. Any of it look familiar to anyone? (BTW, it's bloody hard to photograph an exhaust from under a car on axle stands when you only have an 18-200 78mm lens and its minimum focal length is about the length of your arm

Bloody hell, the contortions I had to go through to bring you these pics hahaha)
*ahem* Back box
Over-axle bend
Mid-section
headers and front pipe
..and from above
I only had time to get one side of the car treated today, so hopefully tomorrow will be dry and I'll be able to finish off. Probably get better pics of the zorst from t'other side as well. Oh, for a pillar lift.....